4 days late, faint line FRER, Negative Blood tests

Roni

So I’m now 4 days late. I was getting faint positives with frer the day of my missed period and then I went yesterday for a blood test and it was negative. Usually my periods always come on time.. my doctor said it may still be early and to come back in a week. So I go back again next Monday for a blood draw but I thought if it’s coming up on frer then it should come up in blood work... anyone have this?